Well we solved our issue with the rainbow shark...he stressed out my molly and started chasing all of the other fish as well, as if he were bigger then them! Anyway he found a new home..we really like the rainbow sharks, might have to get a tank specifically for them!
we are going to try the beta in a week or two we bought a Mickey mouse Platy(which I love!) and another Platy today and everyone seems to have settled in pretty fast..we also bought aquarium salt and added that and boy what a difference in the fish's personalities they seem much happier and full of energy.